From my understanding, I agree with all of what you are saying.
-> Point 3: the paper does not tell which Storm version is used; the concept of executors was introduce with version 0.8.0 -> Point 4: concurrently would be the correct term, though ;) -Matthias On 04/27/2015 05:14 PM, Johannes Hugo Kitschke wrote: > Hi, > > I have a few questions: > > 1. 'Example of a running topology' in the Wiki: > http://storm.apache.org/documentation/Understanding-the-parallelism-of-a-Storm-topology.html > > > The yellow bolt is configured with a parallelism hint of 6. Since no > number of tasks is specified, it imlicitly is equal to parallelism hint. > Now in the next section the number of executors is increased to 10 which > does not make too much sense since # of tasks = const = 6, right? > > 2. The topology is rebalanced to use 5 instead of 2 workers. This > assumes, that 3 additional worker slots are available on the cluster!? > > 3. I read the Storm @ Twitter paper where they write 'A task is strictly > bound to an executor because that assignment is currently static.' This > is outdated, right? How else would the rebalancing work? > > 4. An executor can only execute tasks of the same component. These tasks > are executed in serial. Right? > > Thanks, > Johannes
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